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  <title>Get line number</title>

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</div><hr /><div id="splfileobject.key" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SplFileObject::key</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.0)</p><p class="refpurpose"><span class="refname">SplFileObject::key</span> &mdash; <span class="dc-title">Get line number</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-splfileobject.key-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><strong>SplFileObject::key</strong></span>
    ( <span class="methodparam">void</span>
   )</div>

  <p class="para rdfs-comment">
   Gets the current line number.
  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    This number may not reflect the actual line number in the file 
    if <span class="methodname"><a href="splfileobject.setmaxlinelen.html" class="methodname">SplFileObject::setMaxLineLen()</a></span> is used to 
    read fixed lengths of the file.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 parameters" id="refsect1-splfileobject.key-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-splfileobject.key-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the current line number.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-splfileobject.key-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3873">
    <p><strong>Example #1 <span class="methodname"><strong>SplFileObject::key()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplFileObject</span><span style="color: #007700">(</span><span style="color: #DD0000">"lipsum.txt"</span><span style="color: #007700">);<br />foreach&nbsp;(</span><span style="color: #0000BB">$file&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$line</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">key</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">".&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$line</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
0. Lorem ipsum dolor sit amet, consectetur adipiscing elit. 
1. Duis nec sapien felis, ac sodales nisl. 
2. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
</pre></div>
    </div>
   </div>
  </p>
  <p class="para">
   <div class="example" id="example-3874">
    <p><strong>Example #2 <span class="methodname"><strong>SplFileObject::key()</strong></span> example with <span class="methodname"><a href="splfileobject.setmaxlinelen.html" class="methodname">SplFileObject::setMaxLineLen()</a></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplFileObject</span><span style="color: #007700">(</span><span style="color: #DD0000">"lipsum.txt"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setMaxLineLen</span><span style="color: #007700">(</span><span style="color: #0000BB">20</span><span style="color: #007700">);<br />foreach&nbsp;(</span><span style="color: #0000BB">$file&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$line</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">key</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">".&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$line&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
0. Lorem ipsum dolor s
1. it amet, consectetu
2. r adipiscing elit. 
3. 

4. Duis nec sapien fel
5. is, ac sodales nisl
6. . 

7. Lorem ipsum dolor s
8. it amet, consectetu
9. r adipiscing elit.

</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-splfileobject.key-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="splfileobject.current.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::current()</a> - Retrieve current line of file</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.seek.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::seek()</a> - Seek to specified line</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.next.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::next()</a> - Read next line</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.rewind.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::rewind()</a> - Rewind the file to the first line</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.valid.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::valid()</a> - Not at EOF</span></li>
   </ul>
  </p>
 </div>


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